EP3552285B1 - Protection against contamination for high voltage insulators - Google Patents

Description

The invention relates to a pollution protection device for high-voltage insulators and an arrangement of pollution protection device and high-voltage insulator.

Above-ground high-voltage lines are regularly routed over high-voltage pylons. In order to electrically isolate the high-voltage pylons from the high-voltage lines, high-voltage insulators are provided at the suspension points between the high-voltage lines and the high-voltage pylons.

Long rod insulators are often used, which are suspended from traverses of the high-voltage pylon and at the free end of which the high-voltage line is attached.

Even if the high-voltage insulators are fundamentally designed adequately for the desired insulation between the high-voltage line and the high-voltage pylon, so-called earth faults and ground faults still occur again and again, in which a high-voltage insulator is bridged and the high-voltage line attached to it is connected to the earth via the high-voltage pylon. Depending on the neutral point treatment of the high-voltage network and the duration of the network fault, these single-pole faults can have massive effects on downstream networks and connected consumers, which is why there are efforts in the state of the art to reduce these faults and increase operational safety.

Since bird droppings that directly hit or are deposited on the high-voltage insulators - especially in combination with moisture - have been identified as a cause for the occurrence of earth faults and earth short circuits, the technical specification of the International Electrotechnical Commission IEC/TS 60815-1:200 - Selection and Design of high voltage insulators for use under Pollution conditions - Part 1: Terms, information and general principles before "... installing deterrent devices or bird perches adapted to the local fauna and to the structure" to prevent birds from perching on the high-voltage pylons above the high-voltage insulators, their do business and thus pollute the high-voltage insulators. However, it has been shown that earth faults and ground faults can only be reduced to a manageable extent using appropriate devices.

Protective devices are also known in which roofs are provided directly on the high-voltage mast above the high-voltage insulators on the mast traverses, which are designed to keep bird droppings away from the high-voltage insulators. Even if the contamination of the high-voltage insulators can be significantly reduced using appropriate roofs, the roofs according to the prior art have some disadvantages. The costs for the procurement and installation of the roofs are considerable, the mast statics, especially in ice, snow and strong winds, are negatively affected and maintenance work on the mast traverses and the high-voltage insulators is made more difficult.

In the documents JP H10 199350 A , CN 104 200 935 A , JP 2012 038736 A , US 4,201,883 A , US 5,679,922 A , EP 1 566 869 A1 , US 6,291,774 B1 and WO 96/16416 A1 Various protective devices for high-voltage insulators are known, which are attached to the high-voltage insulator itself and extend in a disk shape around the high-voltage insulator. The protection devices according to the documents US 4,201,883 A , US 5,679,922 A , EP 1 566 869 A1 , US 6,291,774 B1 and WO 96/16416 A1 are expressly designed to protect small animals and are only partially suitable for protection against contamination. The devices actually provided for pollution protection according to of the documents JP H10 199350 A , CN 104 200 935 A and JP 2012 038736 A require complex assembly.

The invention is therefore based on the object of creating a device for the effective reduction of earth faults and earth short circuits on above-ground high-voltage lines due to bird droppings, in which the disadvantages known from the prior art no longer occur or only occur to a reduced extent.

This task is solved by a pollution protection device according to claim 1 and by an arrangement of pollution protection device and high-voltage insulator according to claim 8. Advantageous developments are the subject of the dependent claims.

Accordingly, the invention relates to a pollution protection device for high-voltage insulators for attachment to the insulator cap of the high-voltage insulator, comprising a fastening area which is designed for a positive connection with the insulator cap and has a feed-through opening for the connection element of the insulator cap, and a protective shield which extends radially around the fastening area to cover the high-voltage insulator, wherein at least one tab is attached in the fastening area or on the protective shield, with at least one tab being pivotally attached in the fastening area or on the protective shield in such a way that it protrudes over the feed-through opening in the lowered state, and wherein the tab is at its free End has a part of a latching closure for cooperation with a corresponding counterpart, which is arranged on the opposite side of the feedthrough opening.

The invention further relates to an arrangement comprising a high-voltage insulator with an insulator cap and an on Insulator cap arranged pollution protection device, wherein the pollution protection device is designed according to the invention and is connected to the insulator cap by positive locking

The pollution protection device according to the invention offers good protection for pollution caused by birds, with the bird droppings being kept away from the high-voltage insulator in particular by the protective shield. The invention has recognized that the insulator caps regularly provided for high-voltage insulators - especially if they are designed as long rod insulators - for connection to a high-voltage pylon are particularly suitable for attaching a pollution protection device to them. Adequate fastening can be achieved by positive connection between the fastening area of the pollution protection device and the insulator cap. For the connection element of the insulator cap, with which the insulator cap and so that the high-voltage insulator is ultimately attached to a high-voltage pylon, the pollution protection device has a feed-through opening.

A structural change to the high-voltage insulator, the insulator cap and/or the high-voltage pylon is not necessary for the installation of a pollution protection device according to the invention, so that standardized and already approved components can still be used. Since the pollution protection device according to the invention is arranged on the insulator cap and thus on the ground potential side of the high-voltage insulator, it does not have to meet any special electrical requirements. The positive connection between the fastening area and the insulator cap can also be sufficient so that no further fastening elements are required. In this case in particular, no tools are often required for the actual assembly of the contamination protection device according to the invention.

By extending the protective shield radially around the fastening area that interacts with the insulator cap, it is ensured that the protective shield extends over the entire circumference of the high-voltage insulator. According to the invention, it is provided that the protective shield covers the high-voltage insulator, i.e. is dimensioned such that the extent of the protective shield perpendicular to the longitudinal axis of the high-voltage insulator is equal to or greater in all directions than the respective largest extent of the high-voltage insulator shaft or the insulator shields arranged thereon.

It is preferred if the fastening area is hat-shaped and designed to be placed over the insulator cap. By appropriately shaping, a particularly good positive fit can be achieved between the fastening area and the insulator cap. The term “hat-shaped” includes both design variants in which the protective shield adjoins the lower end of the hat-shaped area in the manner of a “brim” as well as those in which the roof of the hat-shaped area merges directly into the protective shield.

It is preferred if the pollution protection device has a radial assembly opening running from the feedthrough opening to the outer edge of the protective shield for the lateral passage of the connecting element of the insulator cap of the pollution protection device. The pollution protection device can be pushed laterally onto the insulator cap through a corresponding assembly opening, so that the pollution protection device can be installed even when the insulator cap is connected to a high-voltage pylon. Since the assembly takes place on the ground potential side of the high-voltage insulator, it may not even be necessary to switch off the affected high-voltage line.

If the contamination protection device is sufficiently elastic, it may be sufficient if the assembly opening is designed as a slot - i.e. as a gap with zero width - so that the assembly opening can be widened during assembly. Of course, the same applies if the assembly opening is designed as a gap with a predetermined width, which - if there is sufficient elasticity - can be widened during assembly. If the pollution protection device is not (sufficiently) elastic, the mounting opening should preferably have a sufficient minimum width to slide the pollution protection device onto the insulator cap at the narrowest point. In both cases, at least one tab, which optionally extends over the mounting opening, can be provided in order to secure the mounting opening against unintentional passage of the insulator cap and/or to give the contamination protection device additional dimensional stability.

Such a tab can, for example, be pivotally attached to the pollution protection device, for example the protective screen, on one side of the mounting opening and have a part of a latching closure - latching element or engagement opening - at the other end. On the other side of the mounting opening, the counterpart to the snap lock must then be provided, with which the part of the snap lock on the tab can optionally interact. Alternatively, it can be provided to design the tab as a separate tab element, which has a part of a latching closure - latching element or engagement opening - at both ends. In this case, suitable counterparts to the snap locks on the pollution protection device must be provided on both sides of the assembly opening. The tab element can be captively connected to the contamination protection device via a material bridge, whereby this material bridge can be bent or destroyed during assembly.

The mounting opening can be widened in sections to allow the passage of other elements of the high-voltage insulator - for example the holder of an arc protection ring. This makes it possible to avoid permanent deformation of the pollution protection device in the assembled state.

According to one embodiment of the claimed invention, it is provided that at least one tab is attached in the fastening area or on the protective screen. In particular if the insulator cap is designed as a fork cap (see, for example, DIN 48 062, Part 2 from August 1990), the contamination protection device can be used via a corresponding tab be secured against unintentional lifting of the fastening area from the insulator cap. To do this, the tab can be guided between the forks of the fork cap below the fastening bolt.

In an embodiment not belonging to the claimed invention, the free end of the tab can extend beyond the feedthrough opening at least to the outer edge of the protective screen, the tab preferably being arranged parallel to and overlapping with the mounting opening. This ensures that the tab - even if it is inserted through the fork cap as described - extends over the mounting opening and thus serves to cover the mounting opening. In particular if the mounting opening is designed as a gap, the tab can cover the gap in order to ensure a completely closed protective shield. If necessary, the tab in this area can be attached to the protective screen in a detachable or non-detachable manner, for example by gluing.

In this embodiment, which is not part of the claimed invention, it is further preferred if the width of the tab is adapted to the width of the mounting opening and the free end of the tab is provided for closing the radial mounting opening, the edges of the mounting opening preferably each having a guide for the tab . In other words, the tab can - for example after passing through a fork cap - be guided into the side guides of the mounting opening, whereby on the one hand the mounting opening is closed and on the other hand the free end of the tab is secured to the protective screen. In this case in particular, assembly and securing of the contamination protection device can be carried out completely without tools.

According to the invention, the at least one tab is pivotable in the fastening area or attached to the protective screen so that it protrudes over the feedthrough opening in the lowered state. The tab has a part of a latching closure - latching element or engagement opening - at its free end. On the opposite side of the through opening, the counterpart to the latching closure is provided, with which the part of the latching closure on the tab can optionally cooperate. In this case, the tab preferably does not run parallel to the mounting opening so that the counterpart to the snap lock does not coincide with the mounting opening. It is also possible to provide several corresponding tabs and, if necessary, counterparts to the snap closure, which are then preferably arranged at an angular offset relative to the feedthrough opening. By means of several tabs, the pollution protection device can be used for different designs of high-voltage insulators or insulator caps, with generally only one of the several tabs actually being used to secure the pollution protection device. The unused tabs can be separated from the contamination protection device and removed. If openings are provided in the fastening area or on the protective shield for the engagement of locking elements on the free ends of tabs into which no tab engages after assembly, the end areas of unused tabs can be separated and fastened with their locking elements as a closure in these openings.

In a further invention not belonging to the claimed invention, a separate tab element can be provided, which has a part of a latching fastener or latching element at both ends

Access opening - has. Counterparts to the snap locks are then to be arranged at suitable positions on the pollution protection device, for example the protective screen, in order to arrange the feedthrough opening, so that the tab element, when it is attached to the pollution protection device with its two ends, extends over the feedthrough opening. The tab element can be captively connected to the contamination protection device via a material bridge, whereby this material bridge can be bent or destroyed during assembly.

With other versions of the insulator cap - for example as a pan cap according to DIN 48 062, Part 1 from August 1990 - it can be advantageous if the tab has a feed-through opening for a safety pin or an eyelet element at its free end. In this case, the tab is usually not guided through the insulator cap, but lies against it, whereby the tab can be attached to the insulator cap using a safety pin. The safety pin can be guided directly through the feedthrough opening. Alternatively, it is possible for the eyelet of an eyelet element, through which the safety pin is guided, to be guided through the feedthrough opening, with the eyelet element engaging behind the feedthrough opening on the side facing away from the eyelet. The safety pin can in particular be a safety pin that is already basically provided for fastening the insulator cap, so that neither an additional safety pin nor a possible structural change to the insulator cap would be necessary to fasten an additional safety pin.

It is preferred if the protective screen is essentially circular. If an arc protection ring is provided on the high-voltage insulator, it is further preferred if the radius of the protective shield essentially corresponds to the outer radius of the arc protection ring. An arc protection ring is a galvanized metal ring mounted at the level of the insulator cap and therefore above the high-voltage insulator, which, in the event of an arc, forms an arc base parallel to the high-voltage insulator through which the arc current is conducted into the ground. The arc protection ring primarily serves to keep the arc away from the actual high-voltage insulator in order to avoid damage to it. Since great heat is released when an arc occurs, It is advantageous if the protective shield of the contamination protection device according to the invention does not extend beyond the arc protection ring. The heat generated by an arc can then escape easily without the pollution protection device being damaged by the heat development.

It is preferred if the protective screen is inclined outwards in such a way that rainwater flows outwards when installed. By tilting it appropriately, any bird droppings that may be on the protective screen can be washed off, thereby achieving a natural cleaning of the protective screen. The inclination of the protective screen is preferably 10° to 30°, more preferably 20°, relative to the horizontal.

It is further preferred if a drip edge is provided on the outer edge of the protective screen. This can ensure that rainwater or bird droppings that have been soaked through the protective screen do not get inside the underside of the protective screen and subsequently onto the high-voltage insulator. The drip edge can also be designed as an edge element which has a sufficient width in order to provide a tab extending over the mounting opening, which is preferably comparable to the other tabs already described above for selectively closing the mounting opening and forms part of a snap lock at its free end which can optionally cooperate with a corresponding counterpart beyond the mounting opening.

As already stated, the protective shield can be arranged at the end of the fastening area remote from the feedthrough opening. Alternatively, the protective screen is provided at the level of the feedthrough opening. In both cases of the hat-shaped design of the fastening area Pollution protection device according to the invention is easy to produce and has good fastening security due to the positive fit achieved through the fastening area.

Fastening area, protective shield and/or tab can be made in one piece. The contamination protection device is preferably made entirely or partially of plastic, preferably of injection-mouldable plastic. The plastic is preferably weather and UV resistant and also has good resistance to bird droppings. However, it is also possible for the contamination protection device to be made entirely or partially of galvanized sheet steel.

To explain the arrangement according to the invention, reference is made to the above statements.

Figur 1:

eine schematische Darstellung eines Hochspannungsmastes umfassend erfindungsgemäße Anordnungen aus Hochspannungsisolatoren mit erfindungsgemäßen Verschmutzungsschutzvorrichtungen;

Figur 2a-c:

Schematische Darstellungen eines ersten Ausführungsbeispiels einer nicht-erfindungsgemäßen Anordnung aus Hochspannungsisolator und erfindungsgemäßer Verschmutzungsschutzvorrichtung;

Figur 3:

eine schematische Darstellung eines zweiten Ausführungsbeispiels einer nicht-erfindungsgemäßen Anordnung aus Hochspannungsisolator und erfindungsgemäßer Verschmutzungsschutzvorrichtung;

Figur 4a-c:

schematische Darstellungen eines dritten Ausführungsbeispiels einer nicht-erfindungsgemäßen Anordnung aus Hochspannungsisolator und erfindungsgemäßer Verschmutzungsschutzvorrichtung;

Figur 5a,b:

schematische Darstellungen eines weiteren Ausführungsbeispiels einer erfindungsgemäßen Verschmutzungsschutzvorrichtungen; und

Figur 6a-d:

schematische Darstellung der Montage einer Verschmutzungsschutzvorrichtung gemäß Figur 5a,b auf einem Hochspannungsisolator.

The invention will now be described by way of example using advantageous embodiments with reference to the accompanying drawings. Show it:

Figure 1:

a schematic representation of a high-voltage pylon comprising arrangements according to the invention of high-voltage insulators with pollution protection devices according to the invention;

Figure 2a-c:

Schematic representations of a first exemplary embodiment of an arrangement not according to the invention consisting of a high-voltage insulator and a pollution protection device according to the invention;

Figure 3:

a schematic representation of a second exemplary embodiment of an arrangement not according to the invention consisting of a high-voltage insulator and a pollution protection device according to the invention;

Figure 4a-c:

schematic representations of a third exemplary embodiment of an arrangement not according to the invention consisting of a high-voltage insulator and a pollution protection device according to the invention;

Figure 5a,b:

schematic representations of a further exemplary embodiment of a pollution protection device according to the invention; and

Figure 6a-d:

Schematic representation of the assembly of a pollution protection device according to Figure 5a , b on a high voltage insulator.

The Figures 2a-c , 3 and 4a , b do not show any embodiments of the claimed invention, but are helpful for a basic understanding of it.

In Figure 1 a high-voltage pylon 1 is shown with high-voltage lines 2 suspended from it. The high-voltage lines 2 are attached to the traverses 4 via high-voltage insulators 3, which electrically isolate the high-voltage lines 2 from the high-voltage pylon 1 and thus the ground potential. To attach the high-voltage insulators 3 to the trusses 4, these have insulator caps 5.

An arc protection ring 6 is provided at the upper and lower ends of the high-voltage insulators 3, between which any arc that may arise is guided over the high-voltage insulator 3 in order not to damage the high-voltage insulator 3 itself.

A pollution protection device 10 according to the invention is also provided at the upper end of each high-voltage insulator 3.

In Figure 2a the upper end of an arrangement of high-voltage insulator 3 and pollution protection device 10, as in the high-voltage pylon 1 according to Figure 1 is used, shown in more detail in a sectional view.

The high-voltage insulator 3 comprising a shaft and arranged insulator shields is firmly connected to the insulator cap 5, which in this exemplary embodiment is designed as a fork cap, i.e. H. Two parallel fork plates 8 with mutually aligned bolt feedthrough openings are provided as a connecting element 7. The connection to the high-voltage pylon 1 takes place via a suitable bolt (not shown).

The pollution protection device 10, which is in Figure 2b also shown in a top view, includes a fastening area 20 and a protective screen 30.

The fastening area 20 includes a through opening 21 for the connection element 7, the boundary 22 of which rests positively on the two fork plates 8 as an envelope. This creates a positive connection between the pollution protection device 10 and the insulator cap 5.

The protective screen 30 is arranged around the fastening area 20. The protective screen 30 is circular and inclined outwards by a = 20° in such a way that rainwater can drip over the protective screen 30 and its circumferential drip edge 31. The radius of the protective shield 30 essentially corresponds to the outer radius of the arc protection ring 6. The protective shield 30 thus covers the high-voltage insulator 3 and the arc protection ring 6 in such a way that water dripping from the protective shield 30, which may contain parts of bird droppings caught by the protective shield 30 carried along, generally does not hit the high-voltage insulator 3 and also bird droppings deposited directly by a large bird (e.g. stork or heron), which can be sufficient in quantity, the air gap between the two arc protection rings 6 which are exposed to earth or high voltage potential, cannot cause a short circuit.

A radially extending mounting opening 32 is provided in the protective shield 30 and the fastening area 20 for the lateral passage of the connecting element 7 of the insulator cap 5. This mounting opening 32 leads from the through opening 21 in the fastening area 20 to the outer edge of the protective screen 30 and is designed as a gap. The width of the gap is smaller than the extent of the connecting element 7 to be passed through, but the entire contamination protection device 10 is elastically deformable in such a way that the mounting opening 32 can be widened for the lateral passage of the connecting element 7 of the insulator cap 5. The pollution protection device 10 can also be subsequently attached to high-voltage insulators 3 that have already been installed.

A tab 40 is also attached to the fastening area 20, the free end of which extends beyond the through opening 21 to the outer edge of the protective screen 30. The tab 40 is passed between the two forked plates 8 of the insulator cap 5 and can rest against them in a form-fitting manner. The tab 40 continues to run parallel to and overlaps with the mounting opening 32 and thus closes the gap provided there. As in particular in the partial cut according to Figure 2c along line III-III Figure 2b As can be seen, the edges 33 of the mounting opening 32 have guides 34 into which the tab 40 is inserted. The width of the tab 40 is adapted to the width of the mounting opening 32 or its guides 34. If the tab 40 is inserted into the guides 34, as shown, the mounting opening 32 is closed in such a way that liquid bird droppings or bird droppings liquefied by rainwater cannot pass through the mounting opening 32 can reach the high-voltage insulator 3. At the same time, an undesirable lifting of the contamination protection device 10 from the insulator cap 5, in interaction with the fastening bolt guided through the connecting element 7 and the tab 40 carried out below the fastening bolt, at least prevents loss.

The fastening area 20, the protective screen 30 and the tab 40 are made in one piece, for example in an injection molding process from plastic, the plastic being selected to be sufficiently weatherproof and UV-resistant for the intended purpose and, despite its basic dimensional stability, being sufficiently elastic to achieve the expansion described above To enable mounting opening 32.

In Figure 3 is one too Figure 2a-c A comparable arrangement of high-voltage insulator 3 and pollution protection device 10 is shown, although the pollution protection device 10 is designed slightly differently. In the following we will therefore only look at the differences between the in Figure 3 shown embodiment compared to the embodiment according to Figure 2a-c received, while reference is otherwise made to the explanations above.

Like immediately in Figure 3 As can be seen, the fastening area 20 is hat-shaped and designed to be placed over the insulator cap 5. This shape further improves the positive connection between the contamination protection device 10 and the insulator cap 5. The protective shield 30 is arranged at the end of the fastening area 20 remote from the feedthrough opening 21, which is advantageous for injection molding production. In Figure 3 It can also be seen that the shape of the tab 40 is adapted to the hat shape of the fastening area 20. This also makes production easier and also avoids unnecessary tension within the pollution protection device 10 in the operating state, as in Figure 3 is shown. Otherwise, the pollution protection device 10 is as in connection with Figure 2a-c carried out as described.

In Figure 4a-c Another embodiment is shown. In contrast to the embodiments according to Figures 2a-c and 3 However, the high-voltage insulator 3 does not have a fork cap, but rather a pan cap as an insulator cap 5, which also results in some differences in the contamination protection device 10.

Even if the feedthrough opening 21 in the fastening area 20 is adapted accordingly for the passage of the connection element 7 and can basically rest against it (not shown), the positive connection between the fastening area 20 and the insulator cap 5 is essentially through the hat-shaped and for putting over the insulator cap 5 suitable design of the fastening area 20 achieved.

The protective screen 30 is arranged on the side of the fastening area remote from the feedthrough opening 21. The protective shield 30 is comparable to the protective shield Figures 2a-c and 3 dimensioned, inclined and provided with a drip edge 31. In this regard, reference is therefore made to the above statements. The mounting opening 32, on the other hand, is not designed as a wide gap, but only as a slot (i.e. as a gap with zero width). Since the pollution protection device 10, like the previous devices, is made in one piece from a basically dimensionally stable, albeit sufficiently elastic plastic by injection molding, the assembly opening 32 can be widened sufficiently to allow the pollution protection device 10 to be placed laterally on the insulator cap 5 when the high-voltage insulator 3 is in the assembled state to be able to postpone. As in the partial section Figure 4c along line III-III Figure 4b As can be seen, one edge 33 of the mounting opening 32 has a guide 34 into which the other edge 33 is inserted. This results in a releasable closure of the mounting opening 32 designed as a slot, with which the stability of the contamination protection device 10 can be increased. In addition, the mounting opening 32 is sealed so that, for example, liquid bird droppings or bird droppings liquefied by rainwater cannot get through the mounting opening 32 onto the high-voltage insulator 3.

The tab 40 attached to the fastening area 20 is guided up on the connecting element 7 in the installed state and has a through opening 41 through which an eyelet element 42 is guided. Through the eyelet of the eyelet element 42, the safety pin 9, which is common in pan caps, for securing the clapper (not shown) is guided in the connecting element 7, the other end of the eyelet element 42 engaging behind the through opening 41, so that the tab 40 is attached to the safety pin 9 . As a result, the pollution protection device 10 is secured to the high-voltage insulator 3 or its insulator cap 5.

In Figure 5a , b an embodiment of a pollution protection device 10 according to the invention is shown, the use of which on a high-voltage insulator 3 in Figure 6a-d is shown.

The pollution protection device 10 comprises a fastening area 20 with a feedthrough opening 21 for the connection element 7 of a high-voltage insulator 3, which occupies the entire roof of the hat-shaped fastening area 20. The side walls 23 of the fastening area 20 are slotted and have openings 24 on their outside through which a UV-resistant cable tie can be pulled if necessary can, in order to additionally secure the inherently positive connection between the fastening area 20 and an insulator cap 5 passed through it.

The protective screen 30 extends from the roof of the fastening area 20 and is inclined outwards, so that when used properly, rainwater can flow outwards and over the drip edge 31 formed on the outer edge of the protective screen 30 as an edge element 31 '. The protective shield 30 has a radially extending assembly opening 32 through which the connecting element 7 of an insulator cap 5 can be passed for assembly purposes. The one-piece pollution protection device 10 is made of such an elastic material that the mounting opening 32 can be sufficiently widened for this purpose. In addition, the mounting opening 32 also has a widened section 34, through which the holder 6' of an arc protection ring 6 of the high-voltage insulator 3 can be guided without the contamination protection device 10 having to be deformed for this (cf. Figures 6a-d).

Various tabs 40 are provided on the contamination protection device 10.

Some of the tabs 40 - designated 40' below and in the figures for better differentiation - are pivotally attached to the protective screen 30 in such a way that they protrude over the feed-through opening 21 in the lowered state. The tabs 40 'have 43 locking elements 44 at their free ends, with which they can optionally engage in corresponding openings 36 on the protective screen 30 according to the principle of a snap lock. The tabs 40' in question are arranged at an angle with respect to the feedthrough opening 21, so that the pollution protection device 10 can be used with different high-voltage insulators 3 or configurations.

The tabs 40' can - if they are not needed - simply be separated, for example with the help of a side cutter. The ends 43 with the latching elements 44 can in turn be separated from separated tabs 40 'and then used to close the openings 36 that are not required to form a latching closure (cf. Figure 6d ).

A further tab 40 or 40", which is designed analogously to the tabs 40', extends in the lowered state over the mounting opening 32 and can engage with its locking element 44 in the opening 36 provided for this purpose on the protective screen 30 to form a locking closure. The Tab 40" is arranged in such a way that in the lowered state it can additionally secure at least individual previously lowered tabs 40' by placing it over the tab 40' in question.

The tab 40 or 40‴, which is pivotably arranged on the edge element 31′, also extends over the mounting opening 32. However, this tab 40‴ does not have a locking element at its free end 43, but rather engagement openings 45 into which locking elements provided on the edge element 32 37 can intervene to form a snap lock. To increase the locking security, the tab 40‴ includes several engagement openings 45, which interact with corresponding several locking elements 37.

Based on Figures 6a-d now the assembly of the in Figure 5a , b shown pollution protection device 10 on a high-voltage insulator 3 explained. From the high voltage insulator 3 is in Figures 6a-d only the upper part is shown.

The pollution protection device 10 is first placed with its hat-shaped fastening area on the insulator cap 5 of the high-voltage insulator 3. When the high-voltage insulator 3 is fully assembled, this is the installation opening 32 of the protective shield 30 is stretched in such a way that the connection element 7 can be passed through, so that the pollution protection device 10 can first be placed laterally on the high-voltage insulator 3, before a positive connection between the fastening area 21 and the insulator cap 5 is then achieved by moving the pollution protection device 10 in the axial direction of the high-voltage insulator 3 is achieved. The holder 6' of the arc protection ring 6 is guided through the widened section 34 of the mounting opening.

The state of the pollution protection device 10 after the initial placement on the high-voltage insulator 3 is shown in Figures 6a, b.

Like in particular Figure 6b As can be seen immediately, only one of the tabs 40 'is suitably arranged to be guided through the connecting element 7 of the insulator cap 5. This tab 40 'is guided through the connecting element 7 and with its locking element 44 into the corresponding opening 36 in the protective screen 30. The tab 40" is then lowered and the corresponding latching closure is also closed. The remaining tabs 40' are cut off with a side cutter, with the ends 43 of the tabs 40', which include the latching element 44, being cut off again in order to access the free openings 36 to be used as a closure in the protective shield 36.

The state of the pollution protection device 10 after these assembly steps is in Figures 6c , d shown.

Finally, only the tab 40‴ is closed (not shown). In particular, the tabs 40" and 40", when closed, increase the dimensional stability of the pollution protection device 10, which is made in one piece from elastic material.

Claims (9)

1. Contamination-protection device (10) for high-voltage insulators (3) for attachment to the insulator cap (5) of the high-voltage insulator (3), comprising an attachment region (20), which has been designed for a positive connection to the insulator cap (5) and exhibits a feed-through aperture (21) for the connector element (7) of the insulator cap (5), and a protective screen (30) which extends radially around the attachment region (20) in order to cover the high-voltage insulator (3), at least one tab (40", 40", 40‴) having been attached in the attachment region (20) or on the protective screen (30), characterized in that at least one tab (40') has been attached in the attachment region (20) or on the protective screen (30) so as to be capable of swivelling in such a manner that in the lowered state it protrudes across the feed-through aperture (21), said tab (40') exhibiting at its free end (43) a part of a detent closure (44) for interacting with a corresponding counterpart on the opposite side of the feed-through aperture (21).
2. Device according to the preceding claim, characterized in that the attachment region (20) is hat-shaped and designed to be slipped over the insulator cap (5).
3. Device according to either of the preceding claims, characterized in that the contamination-protection device (10) exhibits a radial mounting aperture (32), extending from the feed-through aperture (21) as far as the outer edge of the protective screen (30), for lateral feed-through of the connector element (7) of the insulator cap (5), which has preferentially been widened in some sections.
4. Device according to one of the preceding claims, characterized in that at least one tab (40", 40‴) optionally extending across the mounting aperture (32) has been provided which either has been attached on one side of the mounting aperture (32) so as to be capable of swivelling and at the other end preferentially exhibits a part of a detent closure for interacting with a counterpart provided on the other side of the mounting aperture (32), or which has been realized as a separate tab element which at each of its two ends exhibits a part of a detent closure and wherein the counterparts suitable for this have been provided on both sides of the mounting aperture (32) .
5. Device according to one of the preceding claims, characterized in that the protective screen (30) has been inclined toward the outside in such a manner that in the mounted state rainwater flows off outward, the inclination (α) preferentially amounting to 10° to 30°, more preferentially 20°.
6. Device according to one of the preceding claims, characterized in that a drip edge (31) has been provided on the outer edge of the protective screen (30), and said drip edge (31) may take the form of a marginal element (31') including a tab (40‴) extending across the mounting aperture (32).
7. Device according to one of the preceding claims, characterized in that the attachment region (20), the protective screen (30) and/or the tab (40) are in one piece and/or made of synthetic material, preferentially of injection-mouldable synthetic material.
8. Arrangement comprising a high-voltage insulator (3) with insulator cap (5) and a contamination-protection device (10) arranged on the insulator cap (5), wherein the contamination-protection device (10) has been designed according to one of the preceding claims and has been connected to the insulator cap (5) by positive closure, wherein the insulator cap (5) is preferentially a clevis cap or a socket cap, and/or the high-voltage insulator (3) exhibits an arcing ring (6) in the region of the insulator cap (5).
9. Arrangement according to Claim 8, characterized in that the protective screen (30) has been configured to be substantially circular, the radius of the protective screen (30) preferentially corresponding substantially to the outer radius of an arcing ring (6) of the high-voltage insulator (3).

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